UI/Assets: Initial Asset View UI template

The asset view UI template is a mini-version of the Asset Browser that
can be placed in regular layouts, regions or popups. At this point it's
made specifically for placement in vertical layouts, it can be made more
flexible in the future.
Generally the way this is implemented will likely change a lot still as
the asset system evolves.

The Pose Library add-on will use the asset view to display pose
libraries in the 3D View sidebar.

References:
* https://developer.blender.org/T86139
* https://code.blender.org/2021/06/asset-browser-project-update/#what-are-we-building
* https://code.blender.org/2021/05/pose-library-v2-0/#use-from-3d-viewport

Notes:
* Important limitation: Due to the early & WIP implementation of the
  asset list, all asset views showing the same library will show the
  same assets. That is despite the ID type filter option the template
  provides. The first asset view created will determine what's visible.
  Of course this should be made to work eventually.
* The template supports passing an activate and a drag operator name.
  The former is called when an asset is clicked on (e.g. to apply the
  asset) the latter when dragging (e.g. to .blend a pose asset). If no
  drag operator is set, regular asset drag & drop will be executed.
* The template returns the properties for both operators (see example
  below).
* The argument list for using the template is quite long, but we can't
  avoid that currently. The UI list design requires that we pass a
  number of RNA or custom properties to work with, that for the Pose
  Libraries should be registered at the Pose Library add-on level, not
  in core Blender.
* Idea is that Python scripts or add-ons that want to use the asset view
  can register custom properties, to hold data like the list of assets,
  and the active asset index. Maybe that will change in future and we
  can manage these internally.

As an example, the pose library add-on uses it like this:
```
activate_op_props, drag_op_props = layout.template_asset_view(
    "pose_assets",
    workspace,
    "active_asset_library",
    wm,
    "pose_assets",
    workspace,
    "active_pose_asset_index",
    filter_id_types={"filter_action"},
    activate_operator="poselib.apply_pose_asset",
    drag_operator="poselib.blend_pose_asset",
)
drag_op_props.release_confirm = True
drag_op_props.flipped = wm.poselib_flipped
activate_op_props.flipped = wm.poselib_flipped
```

1 files changed, 91 insertions, 0 deletions

diff --git a/source/blender/makesrna/intern/rna_ID.c b/source/blender/makesrna/intern/rna_ID.c
index 38b00afdc8f..6df03d19538 100644
--- a/source/blender/makesrna/intern/rna_ID.c
+++ b/source/blender/makesrna/intern/rna_ID.c
@@ -126,6 +126,97 @@ static const EnumPropertyItem rna_enum_override_library_property_operation_items
     {0, NULL, 0, NULL, NULL},
 };
 
+/**
+ * \note Uses #IDFilterEnumPropertyItem, not EnumPropertyItem, to support 64 bit items.
+ */
+const struct IDFilterEnumPropertyItem rna_enum_id_type_filter_items[] = {
+    /* Datablocks */
+    {FILTER_ID_AC, "filter_action", ICON_ANIM_DATA, "Actions", "Show Action data-blocks"},
+    {FILTER_ID_AR,
+     "filter_armature",
+     ICON_ARMATURE_DATA,
+     "Armatures",
+     "Show Armature data-blocks"},
+    {FILTER_ID_BR, "filter_brush", ICON_BRUSH_DATA, "Brushes", "Show Brushes data-blocks"},
+    {FILTER_ID_CA, "filter_camera", ICON_CAMERA_DATA, "Cameras", "Show Camera data-blocks"},
+    {FILTER_ID_CF, "filter_cachefile", ICON_FILE, "Cache Files", "Show Cache File data-blocks"},
+    {FILTER_ID_CU, "filter_curve", ICON_CURVE_DATA, "Curves", "Show Curve data-blocks"},
+    {FILTER_ID_GD,
+     "filter_grease_pencil",
+     ICON_GREASEPENCIL,
+     "Grease Pencil",
+     "Show Grease pencil data-blocks"},
+    {FILTER_ID_GR,
+     "filter_group",
+     ICON_OUTLINER_COLLECTION,
+     "Collections",
+     "Show Collection data-blocks"},
+    {FILTER_ID_HA, "filter_hair", ICON_HAIR_DATA, "Hairs", "Show/hide Hair data-blocks"},
+    {FILTER_ID_IM, "filter_image", ICON_IMAGE_DATA, "Images", "Show Image data-blocks"},
+    {FILTER_ID_LA, "filter_light", ICON_LIGHT_DATA, "Lights", "Show Light data-blocks"},
+    {FILTER_ID_LP,
+     "filter_light_probe",
+     ICON_OUTLINER_DATA_LIGHTPROBE,
+     "Light Probes",
+     "Show Light Probe data-blocks"},
+    {FILTER_ID_LS,
+     "filter_linestyle",
+     ICON_LINE_DATA,
+     "Freestyle Linestyles",
+     "Show Freestyle's Line Style data-blocks"},
+    {FILTER_ID_LT, "filter_lattice", ICON_LATTICE_DATA, "Lattices", "Show Lattice data-blocks"},
+    {FILTER_ID_MA,
+     "filter_material",
+     ICON_MATERIAL_DATA,
+     "Materials",
+     "Show Material data-blocks"},
+    {FILTER_ID_MB, "filter_metaball", ICON_META_DATA, "Metaballs", "Show Metaball data-blocks"},
+    {FILTER_ID_MC,
+     "filter_movie_clip",
+     ICON_TRACKER_DATA,
+     "Movie Clips",
+     "Show Movie Clip data-blocks"},
+    {FILTER_ID_ME, "filter_mesh", ICON_MESH_DATA, "Meshes", "Show Mesh data-blocks"},
+    {FILTER_ID_MSK, "filter_mask", ICON_MOD_MASK, "Masks", "Show Mask data-blocks"},
+    {FILTER_ID_NT, "filter_node_tree", ICON_NODETREE, "Node Trees", "Show Node Tree data-blocks"},
+    {FILTER_ID_OB, "filter_object", ICON_OBJECT_DATA, "Objects", "Show Object data-blocks"},
+    {FILTER_ID_PA,
+     "filter_particle_settings",
+     ICON_PARTICLE_DATA,
+     "Particles Settings",
+     "Show Particle Settings data-blocks"},
+    {FILTER_ID_PAL, "filter_palette", ICON_COLOR, "Palettes", "Show Palette data-blocks"},
+    {FILTER_ID_PC,
+     "filter_paint_curve",
+     ICON_CURVE_BEZCURVE,
+     "Paint Curves",
+     "Show Paint Curve data-blocks"},
+    {FILTER_ID_PT,
+     "filter_pointcloud",
+     ICON_POINTCLOUD_DATA,
+     "Point Clouds",
+     "Show/hide Point Cloud data-blocks"},
+    {FILTER_ID_SCE, "filter_scene", ICON_SCENE_DATA, "Scenes", "Show Scene data-blocks"},
+    {FILTER_ID_SIM,
+     "filter_simulation",
+     ICON_PHYSICS,
+     "Simulations",
+     "Show Simulation data-blocks"}, /* TODO: Use correct icon. */
+    {FILTER_ID_SPK, "filter_speaker", ICON_SPEAKER, "Speakers", "Show Speaker data-blocks"},
+    {FILTER_ID_SO, "filter_sound", ICON_SOUND, "Sounds", "Show Sound data-blocks"},
+    {FILTER_ID_TE, "filter_texture", ICON_TEXTURE_DATA, "Textures", "Show Texture data-blocks"},
+    {FILTER_ID_TXT, "filter_text", ICON_TEXT, "Texts", "Show Text data-blocks"},
+    {FILTER_ID_VF, "filter_font", ICON_FONT_DATA, "Fonts", "Show Font data-blocks"},
+    {FILTER_ID_VO, "filter_volume", ICON_VOLUME_DATA, "Volumes", "Show/hide Volume data-blocks"},
+    {FILTER_ID_WO, "filter_world", ICON_WORLD_DATA, "Worlds", "Show World data-blocks"},
+    {FILTER_ID_WS,
+     "filter_work_space",
+     ICON_WORKSPACE,
+     "Workspaces",
+     "Show workspace data-blocks"},
+    {0, NULL, 0, NULL, NULL},
+};
+
 #ifdef RNA_RUNTIME
 
 #  include "DNA_anim_types.h"